Gage-cock



(No Model.) v

M. J. MOUARTER. GAGE 000K.

Patented Jan. 27, 1891.

WITNESSES ATTORNEYS UntTn' STATES PATENT Trice.

lllARSlL-KLL J. MCCARTER, OF NORRISTO'WN, PENNSYLVANIA.

.GAGE-COCK.

SPECIFICATION forming part of Letters Patent No. 445,474, dated January2'7, 1891. Application filed July 3, 1890. Serial No. 357,615. (Nomodel.)

To all whom it may concern:

Be it known that I, MARsHALL J. MCCAR- TER, of Norristown, in the countyof Montgomery and State of Pennsylvania, have invented .a new andImproved Gage-Cock, of which the following is a full, clear, and exactdescription.

The object of the invention to provide a new and improved gage-cockwhich is simple and durable in construction, not liable to get out oforder, and adapted to be packed at anytime when in use and underboiler-pressure.

The invention consists of a piston fitted to slide loosely in a casingor barrel, a rod extending from the-piston through the stuflingbox intothe said barrel and provided with a bore adapted to connect the interiorof the barrel with the outside.

The invention also consists in certain parts and details andcombinations of the same, as will be described hereinatter,and thenpointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement with parts in section.Fig. 2 is a sectional side elevation of the same in a differentposition. Fig. is a sectional side elevation of the improvement asarranged for packing the barrel when under pressure. Fig. 4 is asectional plan view of the improvement on the line m of: Fig. 1,and Fig.5 is asi1nilar view of the same on the line y y of Fig. 2.

The improved gage-cock is provided with a casing or barrel A, having atone end an exterior thread l3, adapted to screw into the shell of theboiler or adapted to connect with a pipe connected with the boiler. Thecasing A is provided with a central bore 0, open at one end to theinterior of the boiler, so that water or steam under pressure can passinto the said bore. A piston D is fitted to slide loosely in the bore 0and is held on a rod E, passing through a stufling-box F, held in theopposite end of the casing A from that which the steam or water entersunder pressure.

On the outer end of the rod E is arranged a suitable handle G, forconveniently manipulating the rod E and its piston D, as hereiir aftermore fully described. In the rod E is produced a bore H, having one endH adapted to open into the bore (J on the lower side of the piston D, asshown in Fig. 2, the other end H of the bore connecting at. all timeswith the outside. hen the piston D is in its innermost position,as shownin Fig. 1, the end 11, as well as the end H is connected with theoutside, so that steam or water pass ing the piston D in the bore (1cannot pass tothe outside on account of the stulfing-box F packing therod E tightly.

On the handle G is secured a guide I, provided with a slot 1, throughwhich passes a screw J, screwing in a lug formed on the easing A. Theguide I's'erves to prevent the rod E and its piston D from turning, atthe same time limiting the upward or downward movement of the same. Bythis arrangement the outlet [1 always stands in one direction, so thatthe operator when trying the boiler is not scalded by the escaping steamor water.

On the rod E, near the piston l), is formed a thread K, adapted to screwinto a thread L, formed in the bore C, near to or at the bottom of thesame. The thread K is so arranged in relation to the guide I that whenthe gagecock is in its normal position, as shown in Fig. 1, the innerend of the thread K is a short distance above the other end of thethread L, so that the two threads do not touch or meet each other. Thescrew J then engagesthe upper end of the slot 1, so that a furtherdownward movement of the rod E is prevented and the threads K and L arenot injured.

The operation is as follows: When the several parts are in position, asshown in Figs. 1 and 2, and the gage-cock is applied on the boiler, thenthe steam or water under pressure passes into the end of the bore C,presses against the piston D, and forces the latter downward until theupper end of the slot 1 of the guide I strikes against the screw J. Whenthe piston D and its rod E are in this position, as shown in Fig. 1, thebore H is disconnected at its upper end H from the bore 0, andconsequently no steam or water can pass from the said bore to theoutside. Now when the operator desires to try the boiler he moves thehandle G upward until the hub oi the handle strikes against thestuffing-box l, as illustrated in Fig. 2. The upper end II of the boreH'now connects with the bore 0, so that the steam and water passing bythe piston D from the boiler will pass into the bore H and out throughthe end H so that the operator can see whether steam or water escapes.The moment the operator releases the pressure on the handle G, the steamor water under pressure in the boiler acts on the piston D and forcesthelattcr downward into the position shown in Fig. 1, so that the boreII is again disconnected from the bore 0. Now, in case the packing F isworn out, so

that steam or water leaks past the rod E, and

it is desirable to repack the barrel, then the operator first removesthe screw J from the guide I, then takes hold of the handle G and turnsthe latter. so that the thread K on the rod E screws in the femalethread L in the barrel'A until the piston D strikes against Ihe upperend of the thread L and prevents further outward movement of the saidrod E. W hen the thread K has engaged the thread L, communicationbetween the bore 0 and the stuffing-box is shut otf, so that theoperator can now conveniently remove the gland of the stuffing-box F,repack the latter, and again screw the stnffing-box on without anydanger of being scalded by leaking steam or water. When this has beenaccomplished, the handle (1? is turned in an opposite direction, so asto unscrew the rod E from the thread L. W'hen the rod I is again in linewith the boss on the barrel A, the screw J is again inserted and lhedevice is again ready for use, as above described. Thus it will be seenthat no valve whatever is necessary in the construction or operation ofthis device, and said device can be rcpacked at anytime when in use andunder boiler-pressure. It will further be seen that in order to actuatethe device itis onlynecessary to press the handle H upward by hand or bya suitable tool, the return motion being accomplished by the pressure ofthe steam or water in the boiler.

In this improved gage-cock no valve or seat is used, and it has neitherlever, crank, nor weight in order to operate it.

The device is not liable to clog or close up with sediment, as thepiston forces out any deposit that may collect while the cock is shut.

In case of leakage, all that is necessary is to repack the device, asabove described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a gage-cock, the combination, with a barrel having a central boreand a screwthread formed therein, of a piston fitted loosely in the saidbore, and a rod extending from the said piston and provided withathreadadapted to engage the said bore-thread, sub stantially as shown anddescribed.

2. In a gage-cock. the combination, with a barrel having a central boreand a screwthread formed therein, of a piston fitted loosely in the saidbore,arod extending from the said piston and provided with a threadadapted to engage the said bore-thread, and a stuffing-box held on thesaid barrel and through which is adapted to pass the said rod,substantially shown and described.

MARSHALL J. MCCARTER. itnesses:

ELwooD MAGEE, GEORGE A. PowEL.

